CVE-2026-20963 — CRITICAL (9.8)

Q: What is CVE-2026-20963?

CVE-2026-20963 is a vulnerability with a CVSS score of 9.8 (CRITICAL). Deserialization of untrusted data in Microsoft Office SharePoint allows an unauthorized attacker to execute code over a network.

Q: How severe is CVE-2026-20963?

CVE-2026-20963 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.

Q: Is there a patch for CVE-2026-20963?

Check the references section above for vendor advisories and patch information. Affected products include: Microsoft Sharepoint Server.

Vulnerability Description

Deserialization of untrusted data in Microsoft Office SharePoint allows an unauthorized attacker to execute code over a network.

CVSS Score

9.8

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

HIGH

Integrity

HIGH

Availability

HIGH

Affected Products

Vendor	Product	Versions
Microsoft	Sharepoint Server	< 16.0.19127.20442

Related Weaknesses (CWE)

CWE-502

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20963Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-US Government Resource

FAQ

What is CVE-2026-20963?

CVE-2026-20963 is a vulnerability with a CVSS score of 9.8 (CRITICAL). Deserialization of untrusted data in Microsoft Office SharePoint allows an unauthorized attacker to execute code over a network.

How severe is CVE-2026-20963?

CVE-2026-20963 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.

Is there a patch for CVE-2026-20963?

Check the references section above for vendor advisories and patch information. Affected products include: Microsoft Sharepoint Server.